The Dragon Variation (Part II)

The Dragon Variation calls for sharp play on Black's part. But the same obligation falls on White as well. In the following game White stumbles at move 10. His mistake seems a very small one, but he soon finds that he has lost the initiative. Black operates in the half open c-file; he gets his outpost at c4; the "Dragon" Bishop joins the action; White's development lags.

Out of the blue, a stunning Queen sacrifice cuts short any thought of further resistance on White's part...